| 摘要 |
PROBLEM TO BE SOLVED: To transmit signals from a multi-point sensor with a single optical fiber, by photo-detecting the light from an object to be monitored, shifting the wavelength, transferring with the optical fiber, and judging the status of the object to be monitored based on the transferred light. SOLUTION: An object to be monitored 2 is irradiated with the light from a light source 1, the light from the object to be monitored 2 is photo-detected with a photo-detection signal transmission mechanism 3, and its wavelength is shifted. The light wherein wavelength is shifted is transferred to a judging part 5 through an optical fiber 4, and based on the transferred light, the status of the object 2 is judged to monitor the object 2. The optical fiber 4 comprises a core part for transferring optical signal and a clad part of reflection material, one of which is doped with a pigment for laser for forming the photo-detection signal transmission mechanism 3, for a detected wavelength to be converted into another wavelength. Relating to the pigment for laser, internal absorption wavelength is different from light-emission wavelength, so, one with such characteristics as causing no self-absorption, among the pigments for laser is doped. With this structure, the single optical fiber 4 is provided with multiple detecting mechanisms. |
